Private Blockchain Interoperability: a Case Study of Interoperable Verification for Professional Assessment Certification

Many researches have aimed to create a model of interoperability between blockchains that can exchange data or assets with each other. However, the current interoperability between blockchains need to improve on the consistency across blockchains. The optimization on blockchain verification should be considered. Also, the exchange of data should maintain a decentralized principle. Interoperability blockchain should avoid the third-party agent on verification. This research presents a private blockchain interoperability model allowing nodes within the blockchain to participate in verifying and signing data for maintain its integrity. It eliminates the need of the third-party agent for the verification. Key commitments are used to validate the keys exchanged between blockchains.  Finally, we applied the model to a case study of interoperable verification for a professional assessment certification between two organizations by using our separate private blockchains.  The experimental results can verify the exam taker scores correctly. The result of assessment was interoperable recorded at the blockchain of both organizations when the verification is correct.